In this paper, a generalization of a result on the uniform best approximation of α cos nx + β sin nx by trigonometric polynomials of degree less than n is considered and its relationship with a well-known polynomial inequality of C. Visser is indicated.
@article{bwmeta1.element.bwnjournal-article-doi-10_4064-ba62-1-5, author = {M. A. Qazi}, title = {On a Problem of Best Uniform Approximation and a Polynomial Inequality of Visser}, journal = {Bulletin of the Polish Academy of Sciences. Mathematics}, volume = {62}, year = {2014}, pages = {43-48}, zbl = {1295.30061}, language = {en}, url = {http://dml.mathdoc.fr/item/bwmeta1.element.bwnjournal-article-doi-10_4064-ba62-1-5} }
M. A. Qazi. On a Problem of Best Uniform Approximation and a Polynomial Inequality of Visser. Bulletin of the Polish Academy of Sciences. Mathematics, Tome 62 (2014) pp. 43-48. http://gdmltest.u-ga.fr/item/bwmeta1.element.bwnjournal-article-doi-10_4064-ba62-1-5/